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Merge pull request #26340 from Microsoft/neverIndexedAccess

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T[K] should be 'never' when T is 'never'
This commit is contained in:
Anders Hejlsberg
2018-08-15 16:07:11 -07:00
committed by GitHub
parent 969b46e44b df2af29977
commit 178f792f18
6 changed files with 59 additions and 1 deletions
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2
src/compiler/checker.ts
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@@ -9149,7 +9149,7 @@ namespace ts {
}
}
if (!(indexType.flags & TypeFlags.Nullable) && isTypeAssignableToKind(indexType, TypeFlags.StringLike | TypeFlags.NumberLike | TypeFlags.ESSymbolLike)) {
if (isTypeAny(objectType)) {
if (objectType.flags & (TypeFlags.Any | TypeFlags.Never)) {
return objectType;
}
const indexInfo = isTypeAssignableToKind(indexType, TypeFlags.NumberLike) && getIndexInfoOfType(objectType, IndexKind.Number) ||